Electrical apparatus for perforating designs.



APPLICATION FILED FEB. 25, 1910.

Patented Oct. 25, 1910.

' n4 THE ucnnls PETERS cn., WASHINGTDN,

T 0 all whom it may concern:

UNITED STATES BOO HENNING WALLIN,

0F GOTTENBOBG,

PAT

NT OFFTGE.

SWEDEN.

Be it known that I, Boo Hnnxrxo TAL- LIN, citizen of Sweden, residing atGottenborg, Sweden, have invented new and useful Improvements inElectrical Apparatus for Perforating Designs, of which the following isa specification.

This invention relates to improvements in electrical apparatus forperforating designs on paper or other similar material for producing ofstencils for the reproduction of designs on textile fabrics or felt orthe like.

The object of the invention is to simplify such apparatus and to makethe same suitable to be used without danger of impact from the electriccurrent.

The apparatus is illustrated by the accompanying drawing in which Figurel is a side elevation and Fig. 2 a plan view of the apparatus.

The apparatus consists of a flat base plate 15 of iron on which is fixeda single electromagnet 1 with the one pole in metallic connection withthe baseplate. Above the other pole the one limb of an angle-bentbarshaped armature 2 passes, the rear end of which armature is in anelastic manner fastened at the baseplate 15 by means of a plate spring8. The armature 2 is placed so near the magnet-pole that, when thecurrent passes through the coil 3, the armature becomes powerfullyattracted whereby a non-conducting pin 4 e. g. of brass, on the top ofthe magnet, prevents the armature from being caught by the magnet. Thefixed limb of the armature is given a rather large breadth in order thatthe spring may get a sufficient stiffness sidewise to keep the armaturesteady without special guides at the free limb. The free end of thearmature 2 is provided with a hole through which a needle carrier 5 isscrewed and directed against the base-plate 15 in such a manner that itsheight above the base plate can be varied as wanted. At its lower endthe needle carrier is provided with a holder 6 of a known type for theneedle 7. When in rest the point of the needle may stand merely a littleabove the base-surface of the apparatus.

An angle-bent appendix on the fixed end of the armature carries acontact spring 11 extending inward toward the magnet, which spring restsupon and may be regulated by a set screw 9. Through a pin 10 the spring11 is in contact with a pole screw Specification of Letters Patent.

Application filed February 25, 1910.

Patented Oct. 25, 1910.

Serial No. 545,861.

| 10 of the electromagnet when the armature is resting. At the contactspot- 12 the spring 11 is covered with some non-oxidizing material e. g.platinum. Above the electromagnet is fixed a non-conducting plate 14-,provided at both ends with pole screws 10 and 16 respectively. The polescrew 10 is in metallic contact with the above-named pin 10. hen closed,the current passes from the pole screw 16 through the coil 3, thebaseplate 15, the spring 8, armature 2, contact-spring 11, pin 10 andout by the polescrew 10. The electromagnet thus being magnetic, attractsthe armature 2 and presses the needle 7 downward through one or moresheets of paper or similar material, on which the apparatus is placed.As soon as the armature 2 becomes attracted the current will be brokenat the contact spot 12, because the spring 11 is moved somewhat awayfrom the pin 10 and then the magnet releases the armature 2, so that thesame with the needle 7 rises by the action of the spring 8 until thespring 11 again comes into contact with the pin 10 when the downwardmovement is repeated. These alternate motions are efiected very rapidlyand by moving the apparatus over the design the needle produces a seriesof corresponding perforations in the paper or the like.

The peculiar placing of the connecting screws and all other detailsbeneath the bent armature prevents them all from being injured evenwithout a special casing over the apparatus as in hitherto-knownapparatus of the same kind and also the person working the apparatus issafe from shocks by the current. Through this arrangement the armatureproper becomes the highest part of the apparatus and the total height ofthe latter becomes very small, so that the apparatus may conveniently beheld by the hand.

Another advantage of the invention is the low position of the joint ofthe armature with regard to the base-plate, in consequence whereof theneedle will swing nearly at right angles against the paper under theapparatus and that without any use of levers, or other device forguiding the needle which by the rapid motion of some 3000 strokes perminute very soon will wear out, rendering the motion of the needleunsteady the reproduction of the design thus becoming imperfect andindistinct.

Having now particularly described and ascertained the nature of my saidinvention and in What manner the same is to be performed, I declare thatwhat I claim is:

An electrical apparatus for the purpose described, comprising a baseplate, a plate spring fixed to and rising from one end thereof, anelectromagnet fixed on the base plate, a non-conducting pin on the topof the magnet, a non-conducting plate fixed above the electromagnet andextending beyond the sides of the same, a pole screw carried at one endof said plate, a pole screw carried at the opposite end of the plate, adepending pin connected With the latter pole screw, an armature fixed tothe inner side of the upright plate spring and having a short armdisposed slightly above the base plate and also having a long armoverhanging the electromagnet and the non-conducting pin and extendingbeyond the former, a needle carrier carried by said extended portion ofthe over hanging arm, a contact spring carried by the short arm of thearmature and opposed to the said depending pin, and a screw bearing insaid short arm and against the underside of the contact spring.

In testimony whereof I have hereunto set i my hand in presence of twosubscribing Wit nesses.

BOO HENNING VVALLIN.

lVitnesses GUSTAF SETH, E1110 MIsorroLM.

